Abstract: Fluorochemical compositions comprising fluorinated compounds, wherein the fluorinated compound comprises fluorochemical oligomeric portion bonded through --O--, --S--, --NH--, or CO.sub.2 -- to a moiety comprising a group derived from an amino resin. Also disclosed are fluorochemical compositions in the form of fluorochemical liquid dispersions and methods for preparing substrates treated with such compositions. Substrates so treated exhibit particularly durable and abrasion-resistant oil and water repellent properties.

Abstract: Disclosed is a receiver sheet which comprises a substrate and a coating which comprises a pigment and a binder comprising polyvinyl alcohol and an additional binder component selected from the group consisting of styrene-butadiene latices, cationic polyamines, cationic polyacrylamides, cationic polyethyleneimines, styrene-vinyl pyrrolidone copolymers, styrene-maleic anhydride copolymers, polyvinyl pyrrolidone, vinyl pyrrolidone-vinyl acetate copolymers, and mixtures thereof. When the receiver sheet is a coated paper, the paper substrate has a Hercules sizing degree of at least about 50 seconds and a basis weight of less than about 90 grams per square meter. When the receiver sheet is a transparency, the substrate is substantially transparent. The receiver sheet is particularly suitable for printing with aqueous based inks, such as those employed in ink jet printing systems.

Abstract: This invention discloses a fiber treatment agent characterized in that it comprises:(A) 100 parts by weight of an organopolysiloxane with no less than 2 hydroxyl groups and/or alkoxyl groups bonded to Si atoms per molecule,(B) 0.5-50 parts by weight of silica and/or a polysilsesquioxane,(C) 0.1-20 parts by weight of an organoalkoxysilane containing amide groups and carboxyl groups, and/or its partial hydrolysis condensate,(D) 0.1-20 parts by weight of an organoalkoxysilane containing amino groups or epoxy groups and/or its partial hydrolysis condensate, and(E) 0.01-10 parts by weight of a curing catalyst, and characterized in that it is also a cationic or non-ionic emulsion.

Abstract: A water absorptive fabric including a layer of a water absorptive polymer whose major components consist of a cross-linked poly(metal salt of acrylic acid) and a water-soluble resin. The fabric may be produced by first impregnating a fabric substrate with a solution which contains a metal salt of acrylic acid in the form of a monomer, a cross-linking agent and a water-soluble resin, and then heating the impregnated fabric substrate to thereby copolymerize the monomer and the cross-linking agent, in the presence of the water-soluble resin.

Abstract: Disclosed herein is a stable fluid mixture and a binding composition containing the same; said mixture comprises a polyisocyanate and a solution of urea in water which is characterized in that the urea is premixed with water before it is admixed with the polyisocyanate to make a urea extended polyisocyanate.

Abstract: A fibrous sheet having the shape memory property which comprises a sheet made of natural fiber and/or synthetic fiber and a layer formed by applying a powder of shape memory polymer; and a method of imparting the shape memory property which comprises applying a powder of shape memory polymer to a desired part of a product of a sheet made of natural fiber and/or synthetic fiber by the aid of a resin adhesive.

Abstract: The present invention is directed to a process for treating textile substrates with a vinyl ester based emulsion polymer containing interpolymerized therein 0.5 to 5% of a polyethylenically unsaturated cross-linking comonomer and subsequently contacting the emulsion coated substrate with a heated metal surface.

Abstract: A fibrous web having an enhanced capacity for water absorption is produced by impregnating an absorbent fabric with a polymer or copolymer capable of forming by cross-linking an absorbent polymer or copolymer and subsequently heating the treated fabric effecting cross-linking of the polymer to form an absorbent polymer. The product may comprise a non-woven fibrous web or mat having a water-insoluble binder on one surface and a cross-linked hydrophilic polymer or copolymer on its opposite surface.

Abstract: A cheese of fiber can be effectively sized with an aqueous emulsion of a cationic polymer, containing 0.2 to 20 g/l of a water-soluble salt, at 30.degree. to 80.degree. C. The polymer preferably includes a copolymer of a vinyl monomer and an unsaturated carboxylic acid on a cationic polymer.

Abstract: Deep-colored fibrous articles, such as fabrics colored in a deep black shade, having on it surfaces a film coating of a resin mixture comprising at least two resins that are mutually miscible but incompatible and in phase-separated conditions. Color-deepening effect is augmented by forming pits and/or recesses and projections on the surfaces of the film coating by using resins different in solvent-solubility and eluting the resin having a larger solubility with a solvent. The above effect is further augmented by using resins different in plasma etching resistance and subjecting the formed film coating to a low-temperature plasma etching treatment. The plasma etching is effectively conducted by placing the fibrous article within a plasma sheath, preferably contacting with an antenna electrode. The deep color can be made abrasion resistant by further depositing an abrasion resistant resinous film on the pit-formed resinous film coating without filling up the pits.

Abstract: The present invention relates to microbiocidal compositions and methods for the preparation and use of of such compositions. Properly used in accordance with the present invention, these microbiocidal compositions are effective in killing or inhibiting a wide variety of harmful, destructive or offensive microorganisms including viruses, bacteria, yeasts, algae and molds. The microbiocidal compositions of the present invention are suitable for use with conventional detergents to provide microbiocidal cleansing agents. The microbiocidal compositions can also be mixed with a liquid to provide an effective disinfectant. The microbiocidal additive can be incorporated into plastic materials and various synthetic fibers thereby imparting microbiocidal activity to the plastic materials or fibers.

Abstract: For cotton spinning, use is made of a treatment agent containing silicone with viscosity at 25.degree. C. of 10 centistokes or greater such as dimethylsilicone, end hydroxy modified dimethylsilicone or epoxy modified dimethylsilicone and an emulsifier such as polyoxyethylene alkylether or polyoxyethylene alkylphenylether. The treatment agent may also contain a cationic or non-ionic surface-active agent within a specified range of weight ratio. The treatment agent is applied to raw cotton during its bale opening or beating opener process at the rate of 0.001-2.0 wt %.

Abstract: The specification describes and claims a method of treating fibrous material which comprises applying to the fibrous material a composition comprising an organosilicon compound having a group .dbd.NCO(CH).sub.n OH connected with a silicon atom of the organosilicon compound. The organosilicon compound consists of or comprises (A) a silane according to the genral formula R.sup.1.sub.a A.sub.b Si(R"NXR').sub.c or (B) a polysiloxane comprising one or more siloxane units according to the general formula (i) ##EQU1## any remaining units of the polysiloxane being at least predominantly according to the general formula (ii) ##EQU2## A represents a hydroxyl or a hydrolysable group, R.sup.1 represents a monovalent hydrocarbon group having up to 8 carbon atoms, R.sup.2 represents a hydroxyl group, a group R.sup.1, a group OR.sup.1 or a group COR.sup.1, R.sup.4 represents a hydrogen atom, an alkyl group having 1 to 20 carbon atoms, an alkenyl group or an aryl group, R.sup.1 represents a group R.sup.

Abstract: Textile materials having improved physical properties comprise woven and/or non-woven fiber assemblies, the fibers of which are bound to a polymer composition containing polymerized carboxylic acid ester monomers and pendant functional groups attached to a polymer backbone and having the formula: ##STR1## in which R.sub.1 is a divalent organic radical at least 3 atoms in length, and X is organoacyl or cyano. Such polymers markedly increase wet and dry strengths and shape retention of textile materials, and they improve other physical properties without the necessity of employing formaldehyde-releasing monomers, such as the N-methylolamides, or cross-linking agents. Methods for producing such textile materials by applying solutions or dispersions of the described polymers to fiber assemblies are also provided. Aqueous dispersions of these polymers are particularly useful for the manufacture of loose-weaves, knits and non-wovens.

Abstract: There is provided a process for preparing a water absorptive composite, which comprises the combination of the steps of (A) applying an aqueous solution containing (a) a polymerizable monomer comprising as a main component acrylic acid, of which 20% or more of the carboxyl groups have been neutralized to its alkali metal salt or ammonium salt, (b) a crosslinking agent, (c) a polyoxyethylene acyl ester with HLB of 7 or more and (d) an oxidative radical polymerization initiator to a prefabricated fibrous substrate and (B) polymerizing the polymerizable monomer applied to the fibrous substrate with addition of a reducing agent to form a composite of a polymer derived from the polymerizable monomer and the fibrous substrate.

Abstract: Heat resistance binders for flexible polyester webs may be prepared using an emulsion polymer,the polymer being prepared by a two-stage polymerization procedure wherein a first stage is prepared based on a relatively low Tg ethylene vinyl acetate polymer and a second stage higher Tg polymer thereby combining the advantageous flexibility and film forming properties of the ethylene vinyl acetate copolymer with the stiffness and heat resistance of the higher Tg copolymer.

Abstract: Fibers in non-woven fibrous goods are bonded together by a crosslinked carboxylated acrylate polymer which forms a network of coalesced latex particles bonding contiguous fibers. This network exists as a non-continuous, porous film supported upon the fibers of the non-woven goods. The particles are of polymer derived from a crosslinked carboxylate latex containing from 1-20 phr of itaconic acid (IA) and at least 70 phr of one or more copolymerizable monomers one of which is an acrylate having the structure ##STR1## wherein R.sub.1 is hydrogen or methyl;R.sub.2 represents C.sub.1 -C.sub.20 alkyl, C.sub.2 -C.sub.7 alkoxyalkyl, C.sub.2 -C.sub.7 alkylthioalkyl, or C.sub.2 -C.sub.7 cyanoalkyl; andat least 40 phr of said acrylate in said film is present as an alkyl acrylate in which alkyl is C.sub.4 -C.sub.8.

Abstract: Temperature adaptable textile fibers are provided in which phase-change or plastic crystalline materials are filled within hollow fibers or impregnated upon non-hollow fibers. The fibers are produced by applying solutions or melts of the phase-change or plastic crystalline materials to the fibers. Cross-linked polyethylene glycol is especially effective as the phase change material, and, in addition to providing temperature adaptability, it imparts improved properties as to soil release, durable press, resistance to static charge, abrasion resistance, pilling resistance and water absorbency.

Abstract: There is provided a process for preparing a water absorptive composite material, which comprises the combination of the following steps:(A) applying an aqueous solution of polymerizable monomers comprising as a main component acrylic acid, of which 20% or more of the carboxyl groups have been neutralized to its alkali metal salt or ammonium salt, to a prefabricated fibrous substrate;(B) polymerizing the polymerizable monomers applied to said fibrous substrate to form a composite of a polymer derived from said polymerizable monomers and said fibrous substrate; and(C) irradiating ultraviolet rays onto said composite with its water content being 0.01 to 40 parts by weight per 1 part by weight of said polymer to obtain a water absorptive composite having a lower content of unpolymerized monomers than said composite.

Abstract: Superabsorbent synthetic fibers are prepared by a method wherein segments of synthetic fibers are coated with a solution of (a) a hydrophilic, uncomplexed polymer and (b) a complexing agent, and the coated fibers are fluff or flash dried causing the polymer to complex and to form a superabsorbent coating on the synthetic fibers in situ.

Abstract: There is provided a process for preparing a water absorptive composite material, which comprises the combination of the following steps of:(A) applying an aqueous solution of a polymerizable monomer comprising as a main component acrylic acid, of which 20% or more of the carboxyl groups have been neutralized to its alkali metal salt or ammonium salt, to a prefabricated fibrous substrate;(B) polymerizing the polymerizable monomers applied to said fibrous substrate to form a composite of a polymer derived from said polymerizable monomer and said fibrous substrate; and(C) adding to said composite a crosslinking agent having two or more functional groups reactive with the carboxyl groups and/or carboxylate groups contained in the polymer to react therewith.

Abstract: In a method for bonding a nonwoven web of cellulosic fibers by depositing a polymeric binder on the web, the improvement comprising(1) pretreating the cellulosic fibers by depositing up to about 10 wt % of an adhesion-promoting compound which demonstrates adhesion to cellulosic fibers of at least 200 g as measured by a cellophane laminate test, and(2) depositing on the pretreated cellulosic fibers and amount of an overcoat binder polymer sufficient to provide a bonded self-sustaining web.

Abstract: Heat resistant binders for flexible nonwoven mats may be prepared using an emulsion polymer comprising 100 parts by weight of acrylate or styrene/acrylate monomers, 3 to 6 parts of a blocked, N-methylol containing comonomer, 0 to 3 parts of a water soluble non-blocked N-methylol containing comonomer and 0 to 5 parts of a multifunctional comonomer. The use of the blocked N-methylol containing comonomer permits the incorporation into the latex binders of higher levels of N-methylol functionality with consequent increase in heat resistance. As such, the binders are useful in the formation of heat resistant flexible mats for use in roofing, flooring and filtering materials.

Abstract: The present invention relates to a process and an apparatus for the continuous production of polymers and copolymers of water-soluble monomers particularly arcylic acid and/or methacrylic acid, optionally with additional comonomers, by the polymerization of an aqueous monomer solution that is introduced into the trough that is formed by an endless conveyor belt. The trough-like shape of the conveyor belt changes continuously into an extended flat profile during the polymerization process; starting from the side edges and working towards the center of the trough formed by the conveyor belt, the resulting polymer gel strand is released continuously during the transition of the curved trough-like shape of the conveyor belt into the extended, flat form.

Abstract: Aqueous solution of alkali or ammonium acrylate is applied to a prefabricated fibrous substrate, and the acrylate is subjected to polymerization in two steps, namely the first step in which the acrylate is polymerized by means of a radical polymerization initiator and the second step which is subsequent to the first step and in which the unpolymerized acrylate is polymerized by means of heat treatment at 100.degree.-250.degree. C.

Abstract: Elastomer-coated fabric products having predetermined potential extension in the fabric's machine direction and processes for producing the same. The fabric product of the invention preferably includes an elastomer-coated warp-knit, weft-insert fabric whereby the warp knit yarns provide a first potential elongation (as by selection of the type and/or denier of yarns employed). The fabric is compressed in the machine direction (as by overfeeding the fabric to a tenter frame during production) so as to provide a second potential elongation, and is maintained in its compressed state by virtue of the elastomer coating thereon. The first and second elongation potentials thus collectively establish the total potential elongation for the fabric in the machine direction.

Abstract: Preparations for finishing textiles, more especially sheet-form textiles, based on emulsion polymers of vinyl acetate and/or copolymers thereof with dibutyl maleate containing protective colloids in addition to small quantities of standard auxiliaries, wherein the polymer emulsions contain as a protective colloid polyethylene glycol having an average molecular weight of from about 3000 to 50,000 which was at least partly present during the original emulsion polymerization.

Abstract: The process applies to polymers obtained by a water-in-oil process, that is to say, a reverse emulsion process or a suspension process in reversible phase. The process of fixation of this type of polymer in or on a porous support is characterized in that it comprises the impregnation of the porous support with said reverse suspension or emulsion resulting from the polymerization reaction and the removal of solvent from the support. By said process, complexes are obtained which present improved absorption properties and offer a better holding of the product to the support.

Abstract: Surfaces containing hydroxyl groups are rendered water-repellent through exposure to hydridoaminosilanes of the general formulaH.sub.x Si(NRH).sub.y (NR.sub.2.sup.1).sub.3-yIn particular, tris(dimethylamino)silane and its derivatives have been found to make substrates with hydroxyl-containing surfaces hydrophobic without adversely effecting the physical properties of the substrate being treated and without the necessity of and pre- or post-treatment steps (i.e. moisturizing, neutralizing, etc.).

Abstract: An antimicrobially active, non-woven web, a wet wiper containing the web, and a method of making the web. The method includes the steps of forming an unbonded fibrous web; applying throughout the unbonded fibrous web an uncured polymeric binder; applying a leachable catalyst to catalyze the cross-linking of the binder during curing, the leachable catalyst being antimicrobial; and curing the binder to cross-link the binder and bind the fibers together to form an antimicrobially active, non-woven web.

Abstract: The present invention is directed to a process for the production of optionally foamed polyurethanes which are combined or fabricated with another material, comprising reacting compounds with molecular weights from 400 to 10,000 containing at least 2 isocyanate reactive hydrogen atoms with polyisocyanates in the presence of catalysts containing tertiary amino groups and combining or fabricating the resulting polyurethane with another material, characterized in that the catalysts used are diffusion resistant aminoalkanols corresponding to the general formula ##STR1## wherein R.sup.1, R.sup.2, R.sup.3 and R.sup.4 may be identical or different and represent hydrogen or a C.sub.1 -C.sub.6 alkyl group,R.sup.5, R.sup.6, R.sup.7 and R.sup.8 may be identical or different and represent a C.sub.1 -C.sub.6 alkyl group or together form a C.sub.2 -C.sub.6 alkylene group which may contain hetero atoms such as O or NR (R=C.sub.1 -C.sub.4 alkyl), and n and m may be identical or different and represent integers from 1 to 6.

Abstract: A water absorbent fibrous product comprising a fibrous cellulosic material impregnated with a water absorbent acrylic polymer and a fibrous material, which is produced by a method in which an aqueous solution of a monomeric component comprising acrylic acid and a radical initiator is diffused in a fibrous cellulosic material and heated, followed by blending with a fibrous material. The fibrous product exhibits a high water absorbency, and finds applications as high-quality disposable diapers, sanitary napkins, surgical pads, surgical sheets, paper towels or the like.

Abstract: Polyester/cotton and nylon/cotton blends are rendered flame-resistant in a two step process in which a THP salt prepolymer condensate of urea is applied, exposed to ammonia, then oxidized to form a polymer network in the cotton fibers, and cyclic phosphonate ester or hexabromocyclododecane is applied to impart flame resistance to the nylon or polyester fibers. Flame-resistant cotton/synthetic blended fabrics having excellent hand and washfastness result.

Abstract: The invention relates to a treatment process for improving the dimensional stability of a fibrous sheet obtained by papermaking process, and of which at least part of the fibers are cellulosic fibers, said process consisting in impregnating the sheet with a chemical composition containing at least one wetting agent and one binder.

Abstract: There are provided substantially trialkylsiloxy terminated polysiloxanes having at least one amino or substituted amino group linked to at least one trifunctional siloxy unit of said polysiloxane through an alkylene or arylene bridge. Emulsions of such polysiloxanes as well as methods for treating fabrics therewith are also provided.

Abstract: The resistance to heat and light aging of webs of natural or synthetic fibers is improved by using as a binder a composition comprising a latex of a polymer containing a carboxylic acid functional group, which has been neutralized with a fixed alkali, preferably in conjunction with a latent acid.

Abstract: Nonwoven fabrics characterized by a superior balance of strength and softness are formed utilizing an aqueous emulsion prepared by the emulsion polymerization of a vinyl ester of an alkanoic acid interpolymerized with: 10 to 30% by weight ethylene; 15 to 40% by weight of C.sub.4 -C.sub.10 dialkyl maleate; and 1 to 5% by weight of copolymerizable N-methylol containing monomer.

Abstract: The invention is a method for coating polytetrafluoroethylene fabrics, fibers, yarns, or threads comprising:(a) contacting polytetrafluoroethylene fabrics, fibers, yarns, or threads with a sizing composition of a perfluorinated polymer containing sites convertible to ion exchange groups and a treating agent having:a boiling point less than about 110.degree. C.;a density of from about 1.55 to about 2.97 grams per cubic centimeter; anda solubility parameter of from greater than about 7.1 to about 8.2 hildebrands;(b) removing the treating agent from the sizing composiiton, thereby depositing the perfluorinated polymer onto the surface of the polytetrafluoroethylene; and(c) hydrolyzing the perfluorinated polymer to make it water wettable.Particularly preferred at a treating agent is a compound represented by the general formula:XCF.sub.

Abstract: A soil release composition comprising:(A) a polymer comprising 10 to 100% by weight of constituting units of the formula: ##STR1## wherein R.sub.f is a C.sub.3 --C.sub.21 fluoroalkyl group; R.sup.1 is a hydrogen atom or a C.sub.2 --C.sub.4 acyl group; R.sup.2, R.sup.3, R.sup.4 and R.sup.5 are, the same or different, each a hydrogen atom, a methyl group or an ethyl group; A is a group of the formula: --CH.sub.2 CH(OR.sup.1)CH.sub.2 --OCO-- which R.sup.1 is the same as defined in the above, --CO--, --(CH.sub.2).sub.k N(R.sup.2)CO-- in which R.sup.2 is the same as defined in the above and k is an integer of 1 to 10, or --(CH.sub.2).sub.

Abstract: Textile treating agent for imparting crease resistance is made by mixing 1 mol glyoxal, 2 mols formaldehyde, 1 mol urea and 1.5 mol ethylene glycol and reacting the mixture first at pH 6 to 7 at 60.degree. C. and then at pH 3 at 60.degree.. The product is found to have more stable formaldehyde release properties in textile treating baths as pH of the bath is varied in the range from about 3.0 to about 4.5.

Abstract: In a method of making asbestos-free friction facing material in the form of a water-laid sheet of cellulosic fibres, in which are distributed friction-imparting particles and particles of friction-modifier, the sheet containing a thermosetting phenolic resin which after curing binds the ingredients firmly together, the thermosetting phenolic resin is included in emulsified form in the aqueous suspension of ingredients from which the water-laid sheet is prepared.This leads to a product of more consistent friction performance than is obtained by post-sheeting impregnation with thermosetting phenolic resin.

Abstract: A wiping cloth or similar article especially suitable for wiping glossy hard surfaces to give a streak-free result comprises a flexible absorbent substrate of fibrous material, having a base weight of at least 50 g/m.sup.2 and a thickness of at least 0.5 mm, advantageously consisting at least partially of natural cellulosic fibres, treated with a cationic polyacrylamide to enhance its soil capture capability, and carrying a fully formulated liquid cleaning composition.

Abstract: Synthetic-cellulosic blended fabric is padded with a solution of nitrogen rich N-methylol crosslinking agent, acid catalyst, antimony oxide and a halogen containing alcohol; dried at about 140.degree.-190.degree. F. and then cured at about 250.degree.-400.degree. F. for sufficient time to impart smooth-dry and flame retardant properties to the fabric. Aqueous polyethylene or silicone emulsion softeners can be added to the padding solution if desired. Dibromoneopentyl glycol makes an exemplary halogen containing alcohol. The process can be varied to first pad with antimony oxide, dry, and then repad with a solution of: nitrogen rich N-methylol crosslinking agent, acid catalyst, and a halogen containing alcohol, dry again and cure, at the above specified temperatures.

Abstract: The present invention relates to aqueous solutions or dispersions of polyisocyanate addition products, which contain a quantity of incorporated sulphonate and/or carboxylate groups and optionally ethylene oxide units, --CH.sub.2 --CH.sub.2 --O--, incorporated in a polyether chain to guarantee the solubility or dispersibility thereof in water, the content of sulphonate and/or carboxylate groups being about 2 to 300 milliequivalents per 100 g of solids and the content of the aforementioned ethylene oxide units being up to about 25% by weight, based on solids, characterized in that the polyisocyanate addition products have segments incorporated in the polymer chain which correspond to the following general formula: ##STR1## in an amount of about 0.1 to 20% by weight based on the above formulas, but excluding the weight of R.

Abstract: A method of impregnating a water-penetrable article with a clay slurry includes temporarily inhibiting the swellability of the clay to unexpectedly increase the clay content and decrease the viscosity of the slurry to achieve a higher clay content in a clay-impregnated, water-penetrable article. The swelling capacity of a water-swellable clay composition in contact with water is temporarily inhibited for greater impregnation of the clay into the fibrous article by mixing with a water-swellable clay a water soluble anionic polymer having a weight average molecular weight of about 2,000 to about 150,000 and water. The water soluble anionic polymers temporarily inhibit the swelling capacity of the water-swellable clays to decrease the viscosity of the clay slurry to achieve a higher clay content or more efficient and faster clay impregnation into a water-penetrable, e.g. fibrous, article.

Abstract: Nonwoven fabrics characterized by a superior balance of strength and softness are formed utilizing an aqueous emulsion prepared by the emulsion polymerization of: 30 to 50% by weight of vinyl ester of an alkanoic acid; 10 to 30% by weight ethylene; 30 to 50% by weight of C.sub.4 -C.sub.8 alkyl acrylate; and 1 to 5% by weight of copolymerizable N-methylol containing monomer; wherein the polymerization is performed using batch or semi-batch techniques.

Abstract: A process for improving the abrasion resistance of textile belts without decreasing the flexibility and with a good workability, which comprises applying an aqueous composition comprising a water soluble or dispersible, thermally reactive blocked urethane prepolymer to textile belts, and then subjecting the textile belts to heat treatment, thereby converting the blocked urethane prepolymer into a high molecular weight urethane resin.

Abstract: This invention relates to a process for rendering non-thermoplastic fibers and fibrous compositions flame resistant when contacted with a hot molten material, that involves the application thereto of a flame retardant composition incorporating a water-insoluble, non-phosphorous, solid, particulate mixture of brominated organic compound and a metal oxide or a metal oxide and metal hydrate.

Abstract: A nonwoven substrate impregnated with a vinyl acetate/ethylene/N-methylolacrylamide or vinyl chloride/ethylene/N-methylolacrylamide copolymer emulsion binder is cured by employing an acidic substance having a pKa of 1 to 2, sufficiently drying to volatilize a substantial amount of the water while not substantially cross-linking the copolymer binder and maintaining the dried nonwoven substrate at a temperature less than that for drying for a time sufficient to develop essentially full cure.

Abstract: A fabric is resin-impregnated by placing it between a liquid resin surface and an evacuated space. The fabric can be laid on top of or passed continuously over a liquid resin surface, the resin being heated to a temperature at which it flows readily. A pre-preg produced according to the method can be laminated with other pre-preg or fabric layers into board, but several fabric layers can be impregnated together to form a thick pre-preg.